tps.. how to check it..

[3.0l Sleeper]

how do you check to see if the tps is dead.. or bad... i have a multimeter.. but on the 3.0l v6 tps theres 3 wires.. which ones to i check and how..(car on or running.. and what are the values for a good one..

[3.0l Sleeper]

i was checkin the resistance and i was getting like .9 - 3.8 ohms maybe im checking it wrong.. id like to check the map sensor too but dont know how...

[Anthonytad1985]

Not sure if this will help

MAP Sensor (Typical)

Typical Readings:
Sensor output voltage range is 0.5 to 4.5 volts.

Output voltages between 0.5 and 1.5 volts indicate a high vacuum (low pressure) situation, such as idle or deceleration.

Output voltages between 1.5 and 3.0 volts indicate a medium level of vacuum (pressure) such as a cruise or slight acceleration condition.

Output voltages between 3.0 and 4.5 volts indicate a low vacuum (high pressure) situation such as hard acceleration or a mechanical failure.

Any reading of 0 volts or over 4.5 volts indicates a problem.


NOTE: The following procedure tests the MAP sensor only.

Inspect the rubber nipple (fitting) from the MAP sensor to the throttle body. Repair as necessary. CAUTION: When testing the MAP sensor, be sure that the harness wires are not damaged by the test meter probes.
Test the MAP sensor output voltage at the MAP sensor connector terminal B. With the ignition switch ON, and the engine OFF. Output voltage should be 4 to 5 volts.
Test the MAP sensor output voltage at the MAP sensor connector terminal B at a hot, neutral idle speed condition. The voltage should drop to 1.5 to 2.1 volts.
Test MAP sensor supply voltage at sensor connector terminal C with the ignition ON. The voltage should be approximately 5 volts (±O.5 V).
As always, check the service manual for the proper procedures and specifications for your particular vehicle.

[allmotor]

simply connect your scanner and watch the data as you gradually open and close the throttle. closed throttle should be in the area of .6-.8v and WOT 3.8-4.5v. even more important is to watch for glitches like a dead spot in the TPS... very common proble around mid throttle due to thats where it spends most of it's time and has the most wear on the contact.

[mpgmike]

Allmotor's procedure can be done with an analog ohm meter also. Watch the needle as you sweep the throttle. If there is a hick-up or studder, you have a bad TPS.

Mike

[NAJ]

What year is your Shadow? Are you having a specific driveabilty problem? Were there any fault codes set?
Here is info on checking TPS and TPS circuts with a multimeter;
5 volt reference line VT/WT(Voltages SBEC sends out)
Signal Line OR/DB ( Voltage SBEC Reads )
Sensor Return BK/LB (Ground back to SBEC)
Perform with engine and key off. Disconnect sensor harness and connect ohmmeter(analog prefered) to the sensor signal terminal and the sensor return terminal at sensor.Slowly open the throttle from idle to wide open throttle.The resistance should steadily sweep the needle of the ohmmeter as the resistance changes.If the needle jerks or bounces or momentarily jumps to infinite a crack or bad spot in the resistance substrate has been detected.
If the sensor checks ok then check the circut;
With key on/engine off measure voltage between reference terminal and sensor return terminal of the sensor harness,reference voltage of approx. 5 volts should be present.If not make the same measurements at the computer terminals assigned to that circut,if voltage is present SBEC is fine.
You can check the harness circuts further by jumping TPS signal line to sensor return line with the key on if 5 volts were present and the voltage goes to zero when jumped then the sensor return line is ok.
SBEC TPS terminals (60 way connector)
Term # 6: 5 Volt output (MAP and TPS)
Term # 22: TPS Signal Line
Term # 4: Sensor Return

[hemihead_dave]

Hi, I Own A 94 Ply Duster With A 3.0l, I Have Ran Into Problems With The Connector Pins Breaking Internalof The Connector. I Would Check There First. Map Sensor Connector Same Way.

[Vilpo]

Quote:

Originally Posted by Anthonytad1985 Not sure if this will help MAP Sensor (Typical) Typical Readings: Sensor output voltage range is 0.5 to 4.5 volts. Output voltages between 0.5 and 1.5 volts indicate a high vacuum (low pressure) situation, such as idle or deceleration. Test the MAP sensor output voltage at the MAP sensor connector terminal B at a hot, neutral idle speed condition. The voltage should drop to 1.5 to 2.1 volts.

This instruction seems weird, since the first one says voltage should be 0.5 to 1.5 volts at idle, when the second one says it should be 1.5 to 2.1 at idle?
Which one is correct for the 3.0?

[Dodgeglht]

On the TPS it should be from .5 to 5 volts. .5 at closed throttle & 5 at WOT. Like someone else mentioned if you see any hiccups at all with the voltage reading then the sensor has a dead spot & should be changed. Also if the readings are out of specs.

[Vilpo]

Yes, thanks for the info on the TPS testing. I'm more interested though on the MAP testing, that i quoted there.. Any info on that?

[NAJ]

Map Voltage is directly related to Manifold Vacuum/Pressure.
Map Sensor Responce Charts ;
Naturally Aspirated,Pressure in Inches HG
21.06 HG = 1.10 Volts
18.11 HG = 1.60 Volts
15.15 HG = 2.10 Volts
12.20 HG = 2.60 Volts
9.25 HG = 3.10 Volts
6.30 HG = 3.60 Volts
3.34 HG = 4.10 Volts
0.39 HG = 4.60 Volts
Turbocharged,Pressure in Inches HG
18.11 HG = .93 Volts
12.20 HG = 1.42 Volts
6.30 HG = 1.92 Volts
0.39 HG = 2.41 Volts
2.71 PSI = 2.91 Volts
5.61 PSI = 3.41 Volts
8.51 PSI = 3.90 Volts
11.31 PSI = 4.40 Volts
14.31 PSI = 4.90 Volts
MAP Sensor Fault Codes ;
Code 13, Map Pneumatic Signal or Map Pneumatic Change
Code 14, Map Voltage to Low or Map Voltage to High

[Vilpo]

Thanks.
Mine seems ok, according to this chart.

[jkupp2000]

go to autozone they can check it for free. If they say they cant dont get mad just ask to see a manager or a parts pro. I know that alot of the new people are not trained to test part so if you get someone thats been there for awhile they should be able to test it for you.

[Vilpo]

Hi, i went to test the MAP again because i think i still get an inch low mileage and an inch low power on mine. I got like 1.35 volts on idle, sometimes it would go up to 1.65v on idle. And i got 4.75 volts when accelerating hard/driving. Are these readings a bit high? Anyone else tested readings on their map?

[NAJ]

I posted MAP resonse chart in a sticky in engine management under voltage tables.